Complete the Application for Service Retirement form (TRS. You can submit an online retirement application right from your TCDRS.Forms to apply for benefits ; Form to apply for Medicaid for the Elderly and People with Disabilities or Medicare Savings Program (H1200). Form 1040SR is available as an optional alternative to using Form 1040 for taxpayers who are age 65 or older. Org or 214-580-7700 to set up your account. Use the Interactive Tax Assistant to get retirement income information including pensions, IRAs and Social Security. We suggest you begin uploading your retirement forms and documents into the Retire Now portal 4-6 weeks before your retirement date. To ask for these forms, call 2-1-1 or 1-877-541-7905. To apply for Medicare online, visit the Social Security Administration website and fill out the form. If you want to enroll because you lost your job-based coverage, see our Special Enrollment Period page for more information.